Monitoring the Live Media Startup Process

Switching to the text boot screen is useful, if you suspect that
the system startup process is not proceeding normally. The text screen might contain informational
messages or a request for user input. Switching to the text boot screen
has no impact on the boot sequence, other than how the information is
displayed on the screen. Initialization of the operating system continues and completes as
normal.

To switch to a text boot, press any key a few seconds
after the GUI boot screen appears and the progress animation begins. Note that
after switching from the GUI boot to a text boot, there is no
way to switch back to the GUI boot screen.

Troubleshooting Login and User Account Issues After an Installation

x86: How to Troubleshoot Your Login

Boot the system in single-user mode.

When the boot sequence starts, and the GRUB menu is displayed, type e
to edit the GRUB menu entries.

Select the kernel$ line, then type e to edit the entry.

Type -s at the end of the line to boot the system in
single-user mode.

Press Return to go back to the previous screen, then type b
to boot the system.